Sheet metal casing



` Oct. 19, 1943.

A. coHN SHEET METAL CASING Filed Jan. 16, 1940 n 2 Sheets-$11691'. 1

' K INVENTOR.

5' BY am o@ 19, 1943. A, @HN 2,332,299

, 1N VENT OR.

.Haren on 3 ATTORNEY.

Patented Oct. 19, 1943 PATENT office l nopneaiinnnanwyas 1940, serial Noyers-1:04

1 claim. (Cruz-2.044)

My invention relates `ltocasinfgs such, iorf'lin stance, kas redliator enclosuresfa-nd theprimary obposition so as to form .a itightand rigid .ljoint'between the sections.

l The :sections 4may be. thereby joined'together withfease .butare separable `onflywitii diiicu'lty..

Ji/hen the casing sections .torbe join-edele of sheets of single thickness, they may :be ysecured together by bending fa smarginal portion ef one wall section `.to 'form a tongue rfhaving :an :intermediate shoulder or rib vand insertingsuch tongue in a channel or groove .forinedby .securing iail'eaf spring alonga marginal portion foi raf-'second wall section having 4its ladge zportioniinturned to :form

a shoulder complementary ite "the shoulder 'of the tongue, Whcih is pressed lagainst 'the'ianturned j edge by the leaff spring.

When the casing 'sections arev each formed of spaced' sheetsa marginal portion'oi Afonewal'l.section is bent -to form a tongue of 'sag-itated-cross section providing Aa wedge shaped-for ycuneiforn'! entering edge terminating inoppositelyprojectfl ing shoulders. Such tongueis'iockediniachannel or groeve crmedbetvveen the fsh'eetsfof `a complementary wal-lgseotion foy :inwardly v:protecting strips lfnaving' shoulders complementary to ithe tongue shoulders, fand each :stnip #acts Y1"as `a leaf spring to lsecure :the shoulderofthe-otherfstrip in interlocking engagement 'with :itscomplementary tongue shoulder.

The 'characteristic vfeatures sind."ads/ant-ages' fof my improvements `will further .appear :from "the following descriptionY o'f embodiments sof :my Y:in` vention and the accompanying drawings :.in illustration thereof. v j j In Ithe drawings, Fi'g. l'l is'a l.frontiel'eva'tionnia casing, suitable for use as ra `radiator fenc-ljos'ure, embodying my improvements; alig. :2"is Aa-.topv plan view of the casing shown :inF-ig. lwithzthe cover removed; LFigli yis an enlarged'ragmentary itop plan View of the connection between YAtheiliadt and side sections of the'nasing.; Eigofi :isanlenlarged fragmentary top plan View of a modied connection between the back and side sections of the casing; Fig. 5 is a rear elevation of the casing with the rear section removed; Fig. 6 isan enlarged-fragmentary sectional fview lof Ithe :connection between'the (ro-veranda sidewall; fFig. '7 iis an enlarged fragmentary view taken on the vline 'vl-i1 of Fig. land showing 'the' connection between a L.'f-ront crossbar and `a side wall, but with .the frontipanel removed; Sis-an enlarged `fragmentary fsectionalyiew ltaken onithe line .8-8 .of Fig. i5; Fig. :9fis ia iront-:elevationfofxafmodied casing embodying `my invention `and'lflaving 'walls composed fofcspacedfsheetsi; Eigl isaan enlarged top'nplaniview of the easing shown in Figli) with the-.cover removed; and Fig. y1'1, is an enlarged fragmentary perspective View :showing the con-y nection :between a :side and back sections ofthe casing.

In `thefferrlbodirnent of lmy invention illustrated in Figs. 1 to i8 inclusive, vthe casingiconsist-s of a back'wallgsention I, side wall sections 2' and apertured ffront 'wall 'isection '74 and the flanged topsection 5, feachsection being rstamped from tongues; omas `snoyvn'in Fig'f, eachitonguenmay he .given a sig-moisi crimpftorform thereon a similar `out `foppfositely disposed wsliouldersuch as 6u extending' longitudinally :off the tongue.

YThe:marginal .rear mortions and 9 .off-ith@ .side wall'4 sections 2 and l3 are bent inwardly vsubstai-- tiallymaralie'l to {the'bodies .of Such wall sections, ami-the `,edges =.of such zinturned portions iorm similar 'but oppositely vdisposed shoulders vvS' and yil `Similar@butonnositely1. :lisi'iosed strips yI :and `E i :are'yfeldcdT to'ithe wall sections -2 and 31lparallel to the edges thereof and vIforrn with such `wall sections; channel'sior grooves :for the reception of the tongues 6 and 1. When the 'tonguesiian il arepressedainto vr'theifefhanneis:formedbythe members Zand fI-'O rand Scand H respectively, thermombers A1'0" and fll act zas 1leaf :springs `iiiasing ithe shoulders` B and l" in interlocking relation -W-ith to :the

scoped over theupper :portionsoff thesections l., 2;anii 3. V'SElhe angedfcmfer may hegsecuredin place by the engagement of bowed straps l2 on Jthe wall sections 2 and 3 by resilient tongues I3 projecting downwardly from the cover and having reversely bent heads I3' and shoulders I3". The tongues I 3 are so biased as to hold the shoulders i3" nrmly in engagement with the straps I2 and their dislodgement is hindered by the engagement of the termini of the heads I3 with the walls 2 and 3.

The side sections 2 and 3 have front marginal portions -thereof bent normally to the bodies thereof so as to form flanges I4 and I5'having recessed edges forming seats for the front panel 4.

Similar L-shaped straps I6 and I1 are welded respectively to the side wall 3 and recessed portion of the flange I5 and to the side wall 2 and recessed portion of the flange I4 so as to provide sockets for clips I8 bent over from an angular front cross-bar i9. ed thereto a resilient strip 20 diverging therefrom so as to nt over the vertical iiange of the cross bar I9.' l f Y In shipping the casing, the sections thereof are packed in knocked-down or separatedy form. When the casing is to be assembled, the wall sections 2 and 3 are arranged in parallel relation and the tongues E and 1 are locked in the channels formed by the parts 2 and i0 and 3 and Il respectively. Thecover 5 is then placed on the top edges of the walls andthe tongues I3l thereof forced through the slots formed by the bowed straps i2. The cross bar I9 then has its clips I3 inserted in the sockets formed by the straps It and I1. The top edge of the front panel 4 may then be inserted beneath the front flange of the cover 5, and the panel is lifted until the bottom of the keeper 20 clears the top of the cross bar I9. The lower portion of the panel is then pushed rearwardly into the seats formed by the recessed edges of the anges I4 and I5. The front panel is then dropped until its keeper 29 rests on the horizontal ange of the cross bar i3, in which position the top edge of the panel 4 will stiil be concealed by the front ange of the cover 5.

In the embodiment of my invention illustrateC` in Figs. 9 to 1l inclusive, the casing is composed of a rear wall section 2|, side wall sections 22 and 33, front wall section 24 and cover 25,

The rear wall section 2 Iy is composed of sheetmetal sheets 2Ia and 2lb spaced from one another to form an insulating air space 2Ic. walls 2Ia and 2 lb have their respective marginal side portions 26a and 21a and 2Gb and 21h bent substantially normal thereto and crimped .or ribbed longitudinally to form the respective shoulders 25a', Zeb', 21a and 21b.' The extremities of the members 26a and 26h are 'converged connected together and the extremities of the members 21a and 2lb are converged and connected together along their edges so as to form the sagitate tongues 26 and 21 on opposite sides of the back wall section and'projecting substantially normal therefrom.

The side wall sections 22 and 23 are composed respectively of the sheet metal sheets 22a, 22h and 29a, 23h with the air spaces 22o, 23o between them.

Resilient strips 28a and 2Gb are bent over and secured to the marginal sections of the sheets 22a and 22h and extend therefrom inwardly into the air space 22o.

The strips 28a and 281) are longitudinally crimped to form the oppositely projecting shoulders 28a and 28h', and the edges of the strips 23a and 22h are converged and connected to- The front' panel 4 has weld-` The' gether so as to form a channel 23 of sagitate cross section adapted to receive the tongue 25. The shoulders 26a and 26h are interlocked with and held by the shoulders 28a' and 28h'.

The strip 28a acts as a leaf spring to maintain bearing engagement between the shoulders 26h' and 28h and the strip 28h acts as a leaf spring to maintain bearing engagement between the shoulders 26a' and 28a.

Resilient strips 29a and25b are bent over and secured tothe marginal sections of the sheets 23a and 232? and extend therefrom inwardly into the air space 23C.

The strips 29a and 29h are longitudinally crimped to form the oppositely projecting shoulders 29a' and 29h', and the edges of the strips are converged and connected together to form a channel v29 of sagitate cross section adapted to receive the tongue 21. The shoulders 21aA and 21b are engaged and held by the shoulders 28a and 29D. The strip 29a acts as a leaf spring to maintain the engagement between the shoulders 21h' and 29h', and the strip 2Gb acts as a leaf spring to maintain the engagement between the shoulders 21a' and 29a.

The forward ends of the side wall sections 22 and 23 may be provided with sagitate tongues 26 and 21' similar to the tongues 26 and 21 and the front Wall section 24 may be provided with sagitate channels or grooves 28 and 29' formed by strips similar to the strips forming the channels 28 and 29.

The flanged cover 25 may be secured in place by the engagement of bowed straps 12a on the wall sections 22 and 23 by tongues I3@ xed to the top 25 and similar in construction and operation t0 the tongues I3.

The wall and cover sections may be packed and shipped as knocked-down units and the casing may be assembled at the point of use by insorting the tongues 26, 21, 2S' and 21" into the channels 28, 29, 28 and 29 respectively, and then placing the flanged cover 25 over the walls so that its tongues I3a are locked in the loops formed by the bowed straps IZa.

By each embodiment of my invention there is provided a knock-down casing comprising a plurality of sheet material wall sections, one oi' which has a marginal tongue provided with a shoulder and the other of which has marginal members forming a channel housing the tongue. One of such members has a shoulder complementary to the shoulder of the ltongue and the other of such members maintains the shoulders in interlocked relation by its biasing action..

Having described my invention, I claim:

A knock-down casing comprising a pair of parallel side sections each having an inturned rear edge and a resilient strip adjacent to said edge and forming therewith a channel, said side sections each having a bowed strap extending transversely thereto adjacent to the top thereof and each having an L-shaped strap secured thereto intermediate the top and bottom thereof, a back section having tongues extending normally thereto `and locked in said channels, a top section havingY tongues extending normally thereto and interlocked with said bowed straps, a bar having clips interlocked with said L-shaped straps, and a front section interlocked with said top section and having a resilient strip diverging therefrom and tting over said cross bar.

` AARON COl-IN. 

